cocos creator 官方之提供了换插槽的功能，也就是只能用骨骼的相关特性，一旦需要利用插槽的动画，就必须在插槽下面换贴图，但是官方doc很少，以下是换贴图的代码。
public async addRegionAttachment(ani: sp.Skeleton, slotsName: string, url: string) {
let slot: sp.spine.Slot = ani.findSlot(slotsName);
if (!slot) {
console.error(‘slot is null’, slotsName);
return;
}
if (!slot.attachment) {
console.error(‘attachment is null’, slotsName);
return;
}
let attachment = slot.attachment as sp.spine.RegionAttachment;
if (attachment == null) {
attachment = new sp.spine.RegionAttachment(slotsName);
}
let tex2d = 替换需要的textrue，注意如果用了自动合批，会导致把合批的图弄进来
let region = this.createRegion(tex2d);
let skeletonTexture = new sp.SkeletonTexture({ width: tex2d.width, height: tex2d.height } as ImageBitmap);
if (tex2d) {
skeletonTexture.setRealTexture(tex2d);
//skeletonTexture._texture = tex2d;
}
region.texture = skeletonTexture;
attachment.setRegion(region);
attachment.width = region.width;
attachment.height = region.height;
attachment.updateOffset();
ani.invalidAnimationCache();
// this._slotAttachMap.set(slotsName, attachment);
}
private createRegion(tex2d: Texture2D): sp.spine.TextureAtlasRegion {
console.log('创建region');
let skeletonTexture = new sp.SkeletonTexture({ width: tex2d.width, height: tex2d.height } as ImageBitmap);
if (tex2d) {
skeletonTexture.setRealTexture(tex2d);
}
let region = new sp.spine.TextureAtlasRegion();
// region.page = page;
region.width = tex2d.width;
region.height = tex2d.height;
region.originalWidth = tex2d.width;
region.originalHeight = tex2d.height;
region.rotate = false;
region.u = 0;
region.v = 0;
region.u2 = 1;
region.v2 = 1;
region.texture = skeletonTexture;
return region;
}